V= V
I= A
R= Ω
P= W

OHM'S LAW:

VOLTAGE = RESISTANCE x CURRENT

V = R x I

R = V / I
I = V / R

POWER:

POWER = VOLTAGE x CURRENT

P = V x I

V = P / I
I = P / V
P = R x I2
P = V2 / R